In the lesson Nominative Pronouns, they introduce manche. They show it only being used for plurals. Is this because there is another word used in the other cases? What I mean, is there a completely different word for the others, and not just a variation like with welche and welches? For example, if you were to say you need some sugar, what would be used?
For uncountable amounts like sugar or water, you say "etwas Zucker" or "ein bisschen Zucker".
Yet, 'manche' has a singular form, but it is used rather for poetical reasons:
"Mancher Mann hat sein Leben in der Schlacht verloren" - many a man has lost his life in battle.